CN2392184Y - Large power full automatic electric energy meter harmonic examination meter - Google Patents
Large power full automatic electric energy meter harmonic examination meter Download PDFInfo
- Publication number
- CN2392184Y CN2392184Y CN 99200461 CN99200461U CN2392184Y CN 2392184 Y CN2392184 Y CN 2392184Y CN 99200461 CN99200461 CN 99200461 CN 99200461 U CN99200461 U CN 99200461U CN 2392184 Y CN2392184 Y CN 2392184Y
- Authority
- CN
- China
- Prior art keywords
- electric energy
- automatic electric
- over connection
- converter
- meter
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model provides a harmonic calibrating apparatus of a large-power multi-epi-position electric energy meter with good amplitude-frequency characteristics and a good phase-frequency characteristics when the large power is output. The utility model is mainly characterized in that the feedback element on the lines is provided with I/V and V/V converters and a differential waveshape compensating network; the I/V and V/V adopt a passive compensation mode and are matched with a capacitance-resistance compensating network; the differential waveshape compensating network has a phase detector and an operational amplifier.
Description
The utility model relates to a kind of metering and calibrating device of electric energy meter.
Along with the develop rapidly of power industry and the rapid rising of power consumption, the implementation of system electric energy metrical charge method that especially Every household has an ammeter, anxious the increasing of calibration operation amount that causes electric energy meter.The traditional manual mode of operation that at every turn can only examine and determine one to several tables far can not meet the demands, and in enormous quantities, big electric current, full-automatic inspection table have become inexorable trend.In addition, nonlinear load is increasing on the electrical network, causes the voltage of circuit, current waveform the non-sinusoidal state often to occur.The user draws fundamental energy from electrical network, but to electrical network discharging harmonic wave, causes waveform distortion of the power supply network, and current in middle wire increases, and the line loss aggravation causes electric network pollution, even jeopardizes power grid security.Electric energy meter is subjected to the response of harmonic wave or harmonic wave that the influence of electric energy meter measuring accuracy has been become power supply and electricity consumption both sides questions of common interest in this case.
Under high-power (more than the 300VA) output state, amplitude versus frequency characte and phase-frequency characteristic are serious to become bad, and along with the raising of output frequency, output amplitude seriously drops, and the output quantity phase shift angle seriously increases (these two aspects should be constant when frequency improves).Therefore existing electric energy meter calibrating apparatus can't satisfy the requirement of each harmonic calibrating, promptly can't satisfy the requirement of IEC1036-1996 regulation.
The purpose of this utility model provides a kind of when high-power output, has the high-power multi-epitope electric energy meter harmonic wave calibrating installation of good amplitude versus frequency characte and phase-frequency characteristic.
The purpose of this utility model is achieved through the following technical solutions:
High-power full-automatic electric energy table harmonic wave calibrating installation has signal source, high power amplifier, meter hanging frame, error display and microcomputer, and feedback element on the line is equipped with I/V, V/V converter and difference waveform corrective network.
On the I/V converter, secondary winding is caused by three windings, first winding cross-over connection pull-up resistor R
H, second winding cross-over connection compensating resistance R
C, the 3rd winding cross-over connection building-out capacitor C
CThe secondary winding of V/V converter is caused by three windings, second winding cross-over connection compensating resistance R
C, the 3rd winding cross-over connection building-out capacitor C
C
The difference waveform corrective network has phase detector and operational amplifier.
Above I/V converter and V/V converter are sampling elements, are to convert elementary big electric current high voltage to be convenient to the data acquisition unit sampling standard 1V voltage.The function of difference waveform corrective network is to obtain amplitude-frequency compensation difference DELTA F (f) and phase frequency compensation difference ΔΦ (f).
The utlity model has good amplitude versus frequency characte and phase-frequency characteristic, under the high-power output situation of 500～600VA, under 21 subharmonic states, output amplitude drop 0.5%, the phase frequency angular difference can reach 0.2 ° less than 2 ° when best.And the drop of the amplitude of prior art is 5%, and the phase frequency angular difference can reach 20 °.
Now the utility model is described in further detail by following drawings and Examples:
Fig. 1 is the high-power full-automatic electric energy table harmonic wave calibrating installation amplifying circuit block diagram of the utility model;
Fig. 2 is I/V commutator principle figure;
Fig. 3 is V/V commutator principle figure;
Fig. 4 is the utility model embodiment wiring diagram.
1 is totalizer among the figure, and 2 is power amplifier, and 3 is I/V converter or V/V converter, and 4 is the difference waveform corrective network.Input signal 5Ui (f) with carry out calculus of differences through the waveform of I/V, V/V converter sampling, obtain amplitude versus frequency characte penalty function Δ F (f) and phase-frequency characteristic penalty function ΔΦ (f), and transfer them to totalizer summation, the wave function 5Ui ' that draws (f) delivers to power amplifier again, carries out power output U then
0(f).
I/V converter shown in Figure 2, its principle are Passively compensated, are equipped with the resistance capacitance compensation network, through regulating secondary winding W
2-2And W
2-3The compensating resistance R of institute's cross-over connection
CWith building-out capacitor C
CValue, realize " zero magnetic flux " in the iron core, in using frequency range, obtain high precision, ratio is better than 5 * 10
-5, angular difference is better than 1m °.R among Fig. 2
HBe pull-up resistor, produce standard 1V voltage.Not existing together of V/V converter shown in Figure 3 and I/V converter is W
2-1There is not R on the winding
HPull-up resistor is by regulating capacitance-resistance parameter (R
C, C
C), make elementary winding W
1In be " zero current ", its precision is identical with I/V converter precision.
In the embodiment that Fig. 4 provides, 3 is the V/V converter, elementary winding W
1Be 5000 circles, secondary winding W
2-2Be 10 circles, W
2-3Be 10 circles, W
2-1Be 50 circles, compensating resistance R
CBe 10k Ω, building-out capacitor C
CBe 10nF, in the difference waveform corrective network, phase detector is 4033, and operational amplifier is OP-07, and operational amplifier also is OP-07 in the totalizer, and the resistance of each resistance is respectively R in the circuit
1Be 20k Ω, R
2Be 10k Ω, R
3Be 10k Ω, R
4Be 10k Ω, R
5Be 3k Ω, R
6Be 10k Ω, R
7Be 10k Ω, R
8Be 5k Ω, R
9Be 2k Ω.The present embodiment output power is 500VA, and under 21 subharmonic states, the amplitude drop is 0.5%, and the phase frequency angular difference is 1.0 °, satisfies the requirement of IEC1036 fully.
Claims (3)
1, high-power full-automatic electric energy table harmonic wave calibrating installation has signal source, high power amplifier, pocket watch device, error display and microcomputer, and the feedback element that it is characterized by on the line is equipped with I/V, V/V converter and difference waveform corrective network.
2, high-power full-automatic electric energy table harmonic wave calibrating installation according to claim 1, the secondary winding that it is characterized by the I/V converter is made up of three windings, first winding cross-over connection pull-up resistor R
H, second winding cross-over connection compensating resistance R
C, the 3rd winding cross-over connection building-out capacitor C
C, the secondary winding of V/V converter is made up of three windings, second winding cross-over connection compensating resistance R
C, the 3rd winding cross-over connection building-out capacitor C
C
3, high-power full-automatic electric energy table harmonic wave calibrating installation according to claim 1 and 2 is characterized by the difference waveform corrective network and has phase detector and operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99200461 CN2392184Y (en) | 1999-01-13 | 1999-01-13 | Large power full automatic electric energy meter harmonic examination meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99200461 CN2392184Y (en) | 1999-01-13 | 1999-01-13 | Large power full automatic electric energy meter harmonic examination meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2392184Y true CN2392184Y (en) | 2000-08-16 |
Family
ID=33996444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99200461 Expired - Fee Related CN2392184Y (en) | 1999-01-13 | 1999-01-13 | Large power full automatic electric energy meter harmonic examination meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2392184Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104360304A (en) * | 2014-11-07 | 2015-02-18 | 国家电网公司 | Three-phase broadband current generator |
| CN104991219A (en) * | 2015-06-23 | 2015-10-21 | 国网天津武清供电有限公司 | On-site verification load compensator |
| CN112986889A (en) * | 2020-12-08 | 2021-06-18 | 浙江武义电气安装工程有限公司 | System and method for checking current transformer for distribution network |
-
1999
- 1999-01-13 CN CN 99200461 patent/CN2392184Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104360304A (en) * | 2014-11-07 | 2015-02-18 | 国家电网公司 | Three-phase broadband current generator |
| CN104991219A (en) * | 2015-06-23 | 2015-10-21 | 国网天津武清供电有限公司 | On-site verification load compensator |
| CN112986889A (en) * | 2020-12-08 | 2021-06-18 | 浙江武义电气安装工程有限公司 | System and method for checking current transformer for distribution network |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |